Mavic Pro vs. Mavic Pro Platinum – What's the difference?

The only differences are that the Mavic Pro Platinum has an extended flight time of 30 minutes with an increased hover time of 27 minutes. It also has 4dB (60%) aircraft noise reduction.

Can I use a Mavic Pro battery in my Mavic Pro Platinum? 

Yes, you can.

Will the Mavic Pro Platinum maintain its noise reduction in all flight modes? 

Yes, it will.